Artificial tooth



Feb. 26, 1924;

L. H. SPRINKLE ARTIFICIAL TOQTH Filed Dec. 13 1922 INVENTOR LHKE H.SlYi72/KZ BY HIS ATTORNEY Patented Feb. 26, 1924.

LAKE H; srmnn, or BRCGK LYE NEW YOBK.

ARTIFICIAL Tooanf Application filed December 1 3;'1922":' Seria1NofGO6;648.'

- lowing is a specification.

My invention consists in the novel features hereinafter more fullydescribed and the objects of it are:

First: To produce the facing of an artificial tooth, which has no pinsburned into the body thereof, to avoid injuring pins of any metal otherthan platinum.

Second: To provide a means for firmly uniting pins of any suitable metalor alloy to the facing of an artificial tooth after it is burned.

Third: To have said artificial tooth simple, durable and comparativelyinexpensive.

I attain these objects by the artificial tooth shown in the accompanyingdrawings, or by any mechanical equivalent or obvious modification of thesame.

In the drawings, Figure 1 is a section on the line 11 of Figure 2,looking in the direction of the arrows. Figure 2 is rear view orelevation of Figure 1, looking in the direction of the arrow 2.

Similar numerals refer to similar parts throughout the two views:

11 designates the facing of an artificial tooth having formed in therear thereof an opening or cavity, shown in Figure 1 as filled by themembers 12, 14 and 16.

The said cavity has an undercut at the inner end thereof, as shown inboth figures of the drawing. 12 and 14 are the bases of the pins 13 and15 respectively; at their inner ends said bases 12 and 14 have theanchors 18 and 19 respectively which are shaped to fill the part of theundercut of the cavity adjacent thereto, and the space between the saidbases 12 and 14 is filled by the slightly tapered key 16; the taper ofthe said key 16 may be so proportioned as to retain said bases 12 and 14with their anchors 18 and 19 in position after the key 16 is pressedhome therebetween; to achieve that purpose the taper of the key 16 mustnot exceed a certain limit, in accordance with the laws or rules ofmachine design; the limiting value of the taper is approximately shownas in Figure 1 of the drawing.

It is intended that in practice the actual taper of the key 16 shall beless than that shown in the drawings.

To insure the ample pressing home of the key 16, I provide the clearance17 at the inner end thereof bymaking the key 16 somewhat shorter thaneach of the bases 12 and 14 with their anchors 18 and 19.

The pins 13 and 15 are preferably made may be made to extend beyond therear of r the facing 11, as shown in Figure 1, or

it may be made nearly flush with said rear,-

if desired.

Instead of anchoring the bases of both pins 13 and 15 in the same cavityas shown, each pin may be secured in a separate cavity if desired, byproviding an extra base with an anchor and without a pin to cooperatewith the base of each pin and a separate tapered key for securing theextra base with the base of each pin in position, as by removing the pin13 fromthe'base 12, and employing the base 12 with the key 16 to securethe base 14 with the pin 15 in position. Instead of placing the pins 13and 15 with their bases 12 and 14 and the key 16 on the line 11 inFigure 2, they may be placed on a line at right angles to the line l-1,if desired. Many other changes could be made in the details of myartificial tooth without departing from the main scope of my invention.

I do not therefore restrict myself to the details as shown but I intendto include also all mechanical equivalents and reasonably obviousmodifications of the same within the scope of my invention.

WVhat I claim as my invention and desire to secure by Letters Patent is:o

1. In an artificial tooth, a facing having formed therein a cavity, anundercut at the inner end of said cavity, one or more pins having eachaabase with an anchor at the inner end thereof, said anchor beingadapted to engage said undercut and a member, adapted to actas a keypressed against said base in said cavity, thereby securing said base inposition.

2. In an artificial tooth, a facing having formed therein a cavit anundercut at the inner end of said cavity, one or more pins having each abase with an anchor at the inner end thereof, said anchor being adaptedto engage said undercut, and av tapered key for securing said base inposition, the taper of said key being such as to cause said key to beretained in position after being pressed home into position.

3. In an artificial tooth a facing having 5 formed therein a cavity, anundercut at the inner end of said cavity, a pair of pins having each abase at the inner end thereof,

7 and an anchor at the inner end of each of said bases, said anchorsbeing adapted to engage said undercut, combined with a tapered keyadapted to be pressed into position between said base-s, therebysecuring the same in said cavity.

LAKE H. SPRINKLE.

